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post #1 of 12 (permalink) Old 06-16-2017, 01:16 AM Thread Starter
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Help identifying knob

Hey all,

My girlfriend dropped her bike today (low speed, parking in gravel and she is completely fine). The bike was mostly undamaged, however I noticed a knob that had broken off (found next to the bike), and after about 15 minutes of inspecting the bike, I cannot determine what the knob is (was) or from where it broke off the bike.

She rides a 2003 Bonneville T100. I also ride a Bonneville, but the knob does not look familiar to me. At first glance, I thought it was a valve stem (to give you an idea of what it looks like) but that's not what it is. It looks like there is a metal pin of some kind in the center that snapped clean off. See the photo. Any help would be greatly appreciated.

Thanks,

Paul
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Paul
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post #2 of 12 (permalink) Old 06-16-2017, 01:48 AM
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Looks like the mileage trip knob on the side of the speedo


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post #3 of 12 (permalink) Old 06-16-2017, 01:48 AM
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Looks like the re-set knob from the speedo (part # T2503106)
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post #4 of 12 (permalink) Old 06-16-2017, 01:52 AM
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post #5 of 12 (permalink) Old 06-16-2017, 08:31 AM
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Like the others say, it is the trip reset knob from the speedo. I had the same problem on my 2002 T100. It looks like the shaft from the speedo mechanism is still threaded into it, which means that the shaft is broken and you will need to replace the speedo to get that function back. Quite a few threads years ago about finding a fix for that, can't remember if anyone was successful but I know that I tried real hard to no avail. If you search way back you may find a cure. The main PIA is that you have to remember the mileage when you gas up instead of resetting the trip. As you get older your memory goes and that gets more difficult. If you are really really lucky there may be enough of the shaft left to re-attach, if there is go buy yourselves a lottery ticket.
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post #6 of 12 (permalink) Old 06-17-2017, 06:55 PM
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Several yrs ago I broke my knob off 2007 t100. I used jb weld and it worked.

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post #7 of 12 (permalink) Old 06-17-2017, 07:19 PM
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Just be cautious that however you repair it, try to ensure it is water sealed. There have been reports of water damage on the instrument clusters on our Air cooled bikes leading to all sorts of potentially costly repairs. Not sure how this knob engages in the cluster....try to research it...

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post #8 of 12 (permalink) Old 06-17-2017, 08:33 PM
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Damn, I was expecting something else

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post #9 of 12 (permalink) Old 06-17-2017, 09:11 PM
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Quote:
Originally Posted by Tornado99 View Post
Just be cautious that however you repair it, try to ensure it is water sealed. There have been reports of water damage on the instrument clusters on our Air cooled bikes leading to all sorts of potentially costly repairs. Not sure how this knob engages in the cluster....try to research it...
2003 is purely mechanical, no complicated electronics to scare you.
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post #10 of 12 (permalink) Old 06-19-2017, 02:16 AM
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Take it to a speedo/gauge repair shop, they can fix it easy, 'bread a butter' to them. They open up the speedo by removing and replacing the bezel - the chrome ring. Get a quote on repairs, but it is probably cheaper than a new speedo.

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